If you would like to enable auto logon in windows xp, do the very simple step by step below :
- Start > Run > type control userpasswords2 and press Enter
- In User Accounts window, clear / unmark the checkbox on the left side of Users must enter a username and password to use this computer and then click Apply button
- Enter the username and password for the user that you want to logon automatically and the click OK
You’re Done !!! Try reboot your computer and windows should automatically logon with the user that you provide on step 3 above.